20747430 has 96 divisors (see below), whose sum is σ = 62000640. Its totient is φ = 4760640.

The previous prime is 20747423. The next prime is 20747431. The reversal of 20747430 is 3474702.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20747394 and 20747403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18259 + ... + 19361.

It is an arithmetic number, because the mean of its divisors is an integer number (645840).

Almost surely, 2^20747430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20747430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31000320).

20747430 is an abundant number, since it is smaller than the sum of its proper divisors (41253210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20747430 is a wasteful number, since it uses less digits than its factorization.

20747430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146 (or 1143 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 20747430 is about 4554.9346866887. The cubic root of 20747430 is about 274.7818876591.

The spelling of 20747430 in words is "twenty million, seven hundred forty-seven thousand, four hundred thirty".